Fuel and ignition systems not included, use your carburetor, air cleaner, and aftermarket ignition, Specially machined cylinder heads allow use of stock length manifolds. Use your existing carb (re-jetting is required), EFI compatible. Crank and case machined for crank position sensor, Premium S&S Components. S&S cylinder heads, S&S valve springs, forged rocker arms, Made in the U.S.A